A club statement reads: "The 2015 Hammer of the Year kicked-off the new season by putting pen to paper on a deal that will keep him at the club until 2021."
The 26 year old told West Ham TV: "It's great news for me.
"I've been here for two years now and I'm looking forward to the next five seasons now that I've signed.
"Last season, especially with it being the last season at the Boleyn Ground, was pretty special, with the Manchester United game one which will live with me forever.
"This season, we're all looking forward to the new Stadium that's up and running now, the first game with Juventus which is obviously going to be a fantastic day, and the season ahead."
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